Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f4a31a6bac82e4e26e3e858d760606146049c6bf3abd2c9f07b364dc28a637' 
  AND token = 'dU8bCusLmVfXRJXsNab+jxhsHU4GmIo8pTg7cqHTL+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}